Gas burner of sheet metal

ABSTRACT

A gas burner is formed of two elongated channels. The lower channel has a bottom, sides with outwardly extending steps forming ledges therealong, and distal flanges along the top of said sides. The upper channel is inverted. It has a top, two downwardly extending side walls and outwardly extending foot flanges along the bottoms of the side walls. The foot flanges rest on and are welded to the ledges. The distal flanges overlie and are welded to the top of the upper channel. This assembly defines a central main chamber into which gas is introduced, and two side expansion chambers. There are holes through the top from the main chamber to release gas for the main burner flames. There are throttle openings through the side walls of the upper channel to permit gas to flow from the main chamber to the expansion chambers. There are openings through the distal flanges to permit gas to flow from the expansion chambers to form holding flames.

ilrrited States Patent [1 1 Hem [451 Sept. 11,1973

[ GAS BURNER OF SHEET METAL [75] Inventor: Georg Heln, Huckeswagen,

Germany [73] Assignee: Joh. Vaillant KG, Remscheid,

[52] US. Cl 431/349, 239/553.3, 29/157 C [51] Int. Cl. F23d 13/36 [58] Field of Search 431/349; 239/553.3;

Primary Examiner -Carroll B. Dority, Jr.

' Attorney-Howard H. Darbo et al.

[5 7 ABSTRACT A gas burner is formed of two elongated channels. The lower channel has a bottom, sides with outwardly extending steps forming ledges therealong, and distal flanges along the top of said. sides. The upper channel is inverted. It has a top, two downwardly extending side v walls and outwardly extending foot flanges along the bottoms of the side walls. The foot flanges rest on and are welded to the ledges. The distal flanges overlie and are welded to the top of the upper channel. This assembly defines a central main chamber into which gas is introduced, and two side expansion chambers. There are holes through the top from the main chamber torelease gas for the main burner flames. There are throttle openings throughthe side walls of the upper channel to permit gas to flow from the main chamber to the expansion chambers. There are openings through the distal flanges to permit gas to flow from the expansion chambers to form holding flames.

4 Claims, 1 Drawing Figure Patented Sept. 11, 1973 GAS BURNER OF SHEET METAL BACKGROUND AND SUMMARY OF THE INVENTION This invention relates to a gas burner, which comprises a burner tube consisting of two sheet metal channels which have superimposed lateral flanges that are welded together. The upper channel is formed with main burner holes and laterally positioned throttle openings. The burner also comprises expansion chambers extending along the sides between the two channels. The two channels define .a central main gas chamber and expansion chambers at each side thereof. The throttle openings communicate between the main gas chambers at interior of the burner tube and the expansion chambers. The expansion chambers have auxiliary burner openings on which holding flames are formed and which prevent a blow-off of the main flames burning on the main burner holes even when a gas is used which has a relatively low burning velocity.

A gas burner is known which comprises a burner tube consisting of a cylindrically curved sheet metal hollow member, which has edge portions that are outwardly angled and joined. A cover member is mounted on this cylindrical hollow memberanddefines earlike expansion chambers which communicate through throttle openings with the interior of the burner tube. Adjacent to the burner holes, the cover member'is formed with apertures which are spaced from and expose the burner holes. Holding flames are iormed on auxiliary burner holes formed in the inner side walls of the earlike expansion chambers.

It is also known to connect laterally mounted section ledges by a hollow ridge member to form a rooflikecap, in which the ridge member covers the apex portion of the gas manifold so as to expose the burner'openings. Themain burner holes and those apertures in the ho]- low ridge member which expose the main burner holes are provided in separate members. For this reason, the

members must be exactly aligned with each other as the burner is assembled. Besides, the hollow ridge member must be a good sealing fit on the apex portion of the gas manifold so that an uncontrolled escape of gas at the apertures will be prevented. This requirement involves considerable manufacturing costs.

In a burner of this kind'it is also known to make the burner tube from two shell-like sheet metal members, which have superimposed side flanges joined together the upper sheet metal member being formed with the main burner holes and the throttle openings.

In that burner, the expansion chambers are formed by a third sheet metal member which is substantially V-shaped in cross-section and is mounted on the top of the upper sheet metal member and is welded thereto at its edges. The upper sheet metal member has basically the shape of a roof, and an upwardly extending exit chamber is formed at the ridge portion of said roof. Main burner holes are provided in the top of said exit chamber. Auxiliary burner holes are formed in the ridge portion of the third sheet metal member and are concentric to the main burner holes and larger in diameter than the latter.

This known arrangement requires three separate members, which must be punched, shaped, and joined in an exactly defined relative position so that considerable manufacturing costs are involved.

It is an object of the present invention to provide a gas burner which is of the kind defined first hereinbefore and distinguishes from the known burners in that it can be manufactured in a particularly simple manner and at low cost.

This is accomplished according to the invention in that the side walls of the lower sheet metal member extend beyond the flanges of the upper sheet metal member to form section ledges, and the side walls are bent around the flanges of the upper sheet metal member and laterally of the main burner openings contact the top of the upper sheet metal member and are welded thereto.

In the arrangement according to the invention, the entire burner consists of two sheet metal channel-like sections. The top section is inverted with respect to the bottom section, is placed thereon and the two are welded together. To form the "expansion chambers, the side walls of the lower channel are bent around and welded to the top of the upper channel. Thus, the parts and operations involved are very simple and lend themselves toan efficient mass production.

DESCRIPTION OF THE DRAWING The drawing is a transverse section through a burner tube of the present invention.

DESCRIPTION OF SPECIFIC EMBODIMENT The following disclosure is offered for public dissemination in return for the grant of a patent. Although it is detailed to ensure adequacy and aid understanding, this is not intended to prejudice that purpose of a patent which is to cover each new inventive concept therein no matter how others may later disguise it by variations in fonn or additions or further improvements. The claims at the end hereof are intended as the chief aid toward this purpose, as it is these that meet the requirement of pointing out the parts, improvements, or combinations in which the inventive concepts are found.

The burner is an individual burner of an appliance burner assembly, which assembly consists of a plurality of individual burners. The individual burner is supplied with gas through a riser pipe I. From the riser pipe the gas flows into the main chamber of the burner tube through an inner pipe 2. The inner pipe 2 extends partly along the individual burner. The burner tubeis formed by two sheet metal channels, 4, 7. The lower channel has a base 3, two side walls 5, 6, l5 with distal flanges 16 along the top of the side walls. The upper channel is inverted with respect to the lower channel and has a top 10, sidewalls 9 in the form of legs and bottom flanges in the form of feet. The sidewalls of the upper channel have outwardly extending steps 6 which form ledges. The flanges 8 of the upper channel rest upon the ledges formed by steps 6 and are welded thereto. This weld can be performed when the upper half of the sides of the lower channel extends outwardly as indicated in dot-dash lines at the left side of the drawing. Thereafter that upper half is bent into place as suggested by the right half of the drawing and the full rooflike top i0, which is formed with main burner holes 11 for the main flames. These openings 11 are in a pattern of two rows on both sides of the ridge of the roof and symetrical with respect to the ridges. Throttle openings 12 extend through the side walls 9 of the upper sheet metal channel 7. Auxiliary gas flows from the main gas chamber in the center of the burner tube through these throttle openings. 12 into expansion chambers 13. From the expansion chambers this gas flows through bores 14 to form holding flames above bores 14. The holding flames prevent a blow-off of the main flames emerging from the main burner holes 11.

The chambers 13 are defined by the upper part 15 of the side walls which continue the flanges 6 of the lower sheet metal member and the distal flange 16, the side walls 9 and the combination of the flange 8 and the step 6 at the bottom. The chambers are approximately rightangled in transverse cross-section (as shown in the drawing). The distal flanges 16 rest on the rooflike top 10 and are welded thereto. The expansion chambers 13 are thus defined by portions of the upper and lower sheet metal channels.

The flange 6 and the step 8 must be tightly welded so that gas can enter the expansion chambers only through the throttle bores 12. On the other hand, the joint between the roof leg 16 and the top 10 need not be absolutely tight.

The ends of these individual burners are closed by offset plates or caps, which ensure a tight seal between the burner chamber and the expansion chambers.

I claim:

1. In a tubular gas burner comprising an elongated enclosed main chamber into which gas is introduced, said chamber having a top with holes through which the gas flows to be burned and form the main burner flames, and elongated expansion chambers communicating through throttle openings with the main chamber and having upper auxiliary burner openings on which holding flames are formed, the improvement wherein said burner comprises:

a first sheet metal channel having a base, upwardly extending side walls and distal flanges along the uppermost part of the side walls, said side walls each having an outwardly extending step forming ledges along the interior of the side walls, said base, side walls and flanges being integral; and

a second inverted sheet metal channel having a top,

side walls in the form of legs extending down from said top and foot-like flanges extending outwardly from the downwardly most portion of said legs, said foot-like flanges resting upon and secured to said ledges whereby the interior of said channels form said main chamber, said top, legs and foot-like flanges being integral;

the portion of said first channel side walls above said step being spaced outwardly from the side walls of the second channel, said distal flanges extending inwardly to contact said top, thereby defining enclosed spaces along each side of the main chamber to form said expansion chambers,

said holes being in said top, said throttle openings being in said second channel side walls, and said auxiliary burner openings being along the top of said expansion chambers.

2. In a gas burner as set forth in claim 1, wherein the assembly of said two channels is generally square in transverse cross-section, said top having the appearance in transverse cross-section of a roof with a ridge, there being two rows of said burner holes positioned in a pattern which is symetrical with respect to said ridge, said expansion chambers being generally rectangular in transverse cross-section, said ledges being approximately at right angles to the side walls of the first channel.

3. In a burner as set forth in claim 2, wherein said foot-like flanges are welded to said ledges and form a gas tight seal therebetween, said distal flanges being welded to said top.

4. In the method of manufacturing a burner as set forth in claim 3, wherein said distal flanges are spaced from said top and said upper parts of said side walls extend outwardly at the time said distal flanges are welded to said ledges, and after said welding said upper parts of said sides are bent inwardly and said distal flanges brought into contact with the upper surface of said top and the two are welded together.

t I? i "UNIT D STATES PAT NT OFFIOE' CERTIFICATE OF, CORRECTION I Patent No. 3,758,265 I Dated September 11, 1973 I Inventor(s) Georg Hein and Karl-ErnstVaillant It is certified that error appears in the abbve-identified patent and that said Letters .Patent are hereby eorreted as shown below: I

Georg -I -Iein, Huckeswage n, Germany" should read --Georg Hein Huckeswagen; and Karl -Ernst Vailiant, Remscheid, both in Germany Signed an d s'eali'ec l this 18th day Of December 1973. I

Attes t; I I I I I I I I I I I I I EDWARD M.F'LETCHE R,JR. I f ENE 1)., TE GTMEY ER Attesting Officer I I "Acting Commissioner of Patents ,1

FORM po'w5o 95 I I iiscoMM-Dc 60376-P69 

1. In a tubular gas burner comprising an elongated enclosed main chamber into which gas is introduced, said chamber having a top with holes through which the gas flows to be burned and form the main burner flames, and elongated expansion chambers communicating through throttle openings with the main chamber and having upper auxiliary burner openings on which holding flames are formed, the improvement wherein said burner cormprises: a first sheet metal channel having a base, upwardly extending side walls and distal flanges along the uppermost part of the side walls, said side walls each having an outwardly extending step forming ledges along the interior of the side walls, said base, side walls and flanges being integral; and a second inverted sheet metal channel having a top, side walls in the form of legs extending down from said top and foot-like flanges extending outwardly from the downwardly most portion of said legs, said foot-like flanges resting upon and secured to said ledges whereby the interior of said channels form said main chamber, said top, legs and foot-like flanges being integral; the portion of said first channel side walls above said step being spaced outwardly from the side walls of the second channel, said distal flanges extending inwardly to contact said top, thereby defining enclosed spaces along each side of the main chamber to form said expansion chambers, said holes being in said top, said throttle openings being in said second channel side walls, and said auxiliary burner openings being along the top of said expansion chambers.
 2. In a gas burner as set forth in claim 1, wherein the assembly of said two channels is generally square in transverse cross-section, said top having the appearance in transverse cross-section of a roof with a ridge, there being two rows of said burner holes positioned in a pattern which is symetrical with respect to said ridge, said expansion chambers being generally rectangular in transverse cross-section, said ledges being approximately at right angles to the side walls of the first channel.
 3. In a burner as set forth in claim 2, wherein said foot-like flanges are welded to said ledges and form a gas tight seal therebetween, said distal flanges being welded to said top.
 4. In the method of manufacturing a burner as set forth in claim 3, wherein said distal flanges are spaced from said top and said upper parts of said side walls extend outwardly at the time said distal flanges are welded to said ledges, And after said welding said upper parts of said sides are bent inwardly and said distal flanges brought into contact with the upper surface of said top and the two are welded together. 